Development of Doom
en.wikipedia.org
en.wikipedia.org
This is a pattern I've spotted quite often, interesting ideas brilliant people have but that can only be executed many years later, when technology catches up.
It's been awhile, but I don't recall DOOM music reminding me of Metallica. I guess I only hear E1M1 in my memory though.
Did you have any particular tracks in mind for comparison?
The soundtrack didn't make a huge amount of money, and wasn't highly visible, would be the real reasons, as far as I can see. Also, arguably, the Blurred Lines lawsuit sets a new precedent for this kind of thing.
The story goes that Bobby Prince, being a lawyer, knew just how much he could copy without infringing, but that seems pretty tenuous in some of these cases.
Around a month later, the first public version of Doom was uploaded to the BBS that Dan Linton ran.
One thing that's clear when reading game source code is that they hard code a lot more than I would writing system or application software. That's to be expected given the nature of the beast, but it's still one of the first obvious differences.